Mechanical refrigeration



June 17, 1930. H. F. FREEMAN MECHANICAL REFRIGERATION Filed Aug. 20, 1926 6 0 gk 3* V R v m 0 w w\ g i u :a H E Hadley F. Free man Inventor Att orneys latentbtl June 17, 1930 NITED STATES" PATENT OFFICE 1 many r. Emma, or mxnwoomonro, ASSIGNOR, BY mime Assmmmw're, 'ro KELV'INATOB conronarron, or, nmnorr, women, n conrom'rron or MICHIGAN unomrcnn marenmrron application-filed August 2c, 1928. Serial No. 130,443.

V ator cabinet, and to signal that the door is open, and the principal object of my invention is toprovide means of this type. In the dravitings accompanying this specification and forming a part'of this application I have shown, for purposes of illustra tion, one form which my lnvention may assume. In these drawings:

Figure 1 is a front elevation of this illustrative embodiment of my invention, while Figure 2 is a diagram showing the circuit connections of the parts shown in Figure 1.

Theembodiment of my invention herein shown comprises a refrigerator cabinet 11 provided with a refrigerated compartment 12 25 accessible through an opening 13 in the front wall of the cabinet 11 arranged to be closed by means of a door 14, and a compressor compartment 15 accessible throu h an opening 16 in the front wall of the cabinet 11 arranged to to be closed by means of a suitable door, not

shown.

Mounted within the upper portion of the refrigerated compartment 12 is a brine tank 17, supported from the refrigerator cabinet 11 by means of a cradle 18 secured to the top wall of the refrigerator cabinet 11 and passmg beneath the brine tank 17 containing within itself a suitable expansion coil, not shown, and in turn supporting an expansion valve 19 connected to the inlet of the expansion coil, and a thermostat 20 responsive'to the temperature Within the refrigerated compart-v ment 12, and to the temperature of the refrigerant within expansion coil end turns 21 surrounding the thermostat 20 and connected to the outlet of the expansion coil.

Mounted within the compressor compartment 15 is a compressor 22 having its inlet connected by means of a duct 23 the end .9 turns 21, a condenser 24 having 1ts inlet con- 19, and an electric'motor 27 .0

nected by means of a'duct 25 to the outlet of the compressor 22 and its outlet connected by means of a duct 26 to the expansion valve rating the compressor 22 by means of a suitable belt 28 and connected to line wires 29 and 30 by means of a conductor 31 connecting one side of the motor 27 directly to the line wire 30, a conductor 32 connecting the other side of the motor 27 to one pole of an electromagnetically operated switch 33, the conductor 34 connectmg the other pole of the switch 33 to one pole of the thermostat 20, and a conductor 35 connecting the other pole of the thermostat 20 di-- rectly to the line wire 29.

From the above description those skilled in the art Wlll understand thatneglecting the electromagnetically operated switch 33' the compressor 22 will be operated to maintain the refrigerated compartment 12 cold under control of the thermostat 20. t

The refrigerator cabinet 11 herein shown also includes means for illuminatin the refrigerated compartment 12, comprising an electric lamp 36 mounted within the refrigerated compartment 12 just below the brine tank 17 means for simultaneously illuminating the space in front of the cabinet 11 and indicating the position of the door 14, comrising an electric lamp 37 mounted on the ront wall of the cabinet 11 above the opening 13; means for supplying energy to the lamps 36 and 37, comprlsing a conductor 38 leading to one terminal of each of the lamps 361 and 37, and a conductor 39' leading from the other terminal of each of the lamps 36 and 37 to 'the terminal 40 of a switch 41, and a conductor 42 leading from the other terminal 43 of the switch 41 back to the line wire 29; means to actuate the electromagnetically o erated switch 33, comprising a conductor 44 eading from the line wire 30 to one terminal of the coil 45 of the switch 33, and a conductor'46 leading from the other terminal of the coil 45 to the terminal 40 of the door switch 41, and the conductor 42 leading from the other terminal 43 of the door switch 41 back to the line wire 29; and means to control the energization of the lamps 36 and 37, and energization of the coil 45 to thus control enerautomatically upon opening and closing thereof, the switch 41 being biased to closed position by means of a suitable spring 47, and

in this position completing the circuit through the lamps 36 and 3?, and through the coil 45 of the electroma etically operated switch 33, the switch cl ein moved to open position by engagement 0 the door 14: with the switch plunger 48, and in this position opening the circuits through the lamps 36 and 37, and through the coil 45 of the electromagnetically operated switch 33, the electromagnetically operated switch 33 being biased to closed position by means of a suitable spring l9, and in this position completing the circuit through the motor 27 under control of the thermostat 20, and the electromagnetically operated switch 33 being movable to open position under the action of the coil 45, and in this position opening the circuit through the motor 27.

From the above disclosure it will be understood loy those skilled in the art that when the door is closed the circuit is interrupted through the lamps 36 and 37, and through the coil 45 of the electromagnetic switch 33, the lamps are idle, and the motor 27 is operated in the normal manner under control of the thermostat 20, and that when the door it is opened the circuit is closed through the lamps 36 and 37, and through the coil 45 of the electromagnetic switch 33, and that the lamps 33 and 37 then become active, and that the electromagnetic switch 33 then acts to open the circuit through the motor 27 to prevent operation of the motor 27 and compressor 22. From the alcove disclosure will therefore be obvious to those skilled in the art that l have provided means accomplishing at least the enumerated purposes of my invention At the same time, it will also he obvious to those skilled in the art that the particular embodiment of my invention herein shown and descrihed may he variously changed modified without departing from the spirit of my invention or sacrificing the advantages thereof, and it will therefore he understood that the disclosure herein is illustrative only, and that invention is not limited thereto l claim:

1, In combination a refrigerator cahinet having anopening therein affording access to a refrigerated portion of said cabinet, and

a door arranged to close said opening; electrically operated mechanical refrigerating means operable to automatically refrigerate a portion of said cabinet, comprising an electric motor, and a circuit for connecting said motor to a source of power; signal means comprising electric means disposed exteriorly of said cabinet, and a circuit for connecting said electric means to a source of power; and singleswitch means in said circuits actuated automatically by said door to prevent operation of said mechanical refrigerating means, and to permit energization of said signal means, when said door is open, and to permit operation of said mechanical refrigerating means, and prevent energization' of said signal means, when said door is closed.

2. In combination a refrigerator cabinet having an opening therein afi'ording access to a refrigerated portion of said cabinet, and a door arranged to close said opening; electrically operated mechanical refrigerating means operable to automatically maintain said refrigerated portion refrigerated, com.- prising an electric motor, and a circuit for connecting said motor to a source of power; interior illuminating means, comprising interior electric lamp means disposed within said refrigerated portion in position to illuminate said refrigerated portion, said interior electric lamp being connected to said motor circuit; signal and exterior illuminating means, comprising exterior electric lamp means disposed exteriorly of said cabinet in position to be visible asa signal and to illuminate thespace in front of said cabinet, said exterior electric lamp being connected to said motor circuit; and single switch means interposed in said circuits actuated automatically by said door arranged to prevent operation of said mechanical refri erating means, and permit energization of'said interior illuminating means, and of signal and exterior illuminating means, when said door is open, and to permit operation of said mechanical refrigerating means, and prevent energization of said interior illuminating means, and of said signal and exterior illuminating means, when said door is closed.

In testimony whereof I hereunto affix my signature.

HADLEY l FREEMAN. 

